Fuel-injection valve

Abstract

Fuel injector, in particular, a fuel injector for the direct injection of fuel into a combustion chamber of an internal combustion engine is described having an actuator for actuating a valve needle, the valve needle having on an injection-side end a valve-closure member which forms a sealing seat together with a valve-seat surface, which is formed on a valve-seat member. Fuel channels are arranged in a valve needle guide, connected to the valve-seat member or designed as a single piece with it, in several rows circumferentially in the valve needle guide, at least one row of fuel channels being arranged, in the resting state of the fuel injector, above a guide line of the valve-closure member.

1. A fuel injector, comprising:
 a valve-seat member including a valve-seat surface formed on the valve-seat member;  
 a valve needle including a valve-closure member arranged on an injection-side end thereof, the valve-closure member including a guide line, the valve-seat surface and the valve-closure member forming a sealing seat;  
 an actuator for actuating the valve needle; and  
 a valve needle guide configured to one of connect to the valve-seat member and be formed as a single piece with the valve-seat member, the valve needle guide including fuel channels arranged circumferentially in a plurality of rows, the fuel channels including at least one row arranged above the guide line if the fuel injector is in a resting state;  
 wherein remaining rows of the fuel channels are arranged between the valve-seat surface and the guide line.  
 
   
   
     2. The fuel injector according to  claim 1 , wherein the fuel injector is used for a direct injection of fuel into a combustion chamber of an internal combustion engine. 
   
   
     3. The fuel injector according to  claim 1 , wherein the valve needle guide is formed on an inlet-side end face of the valve-seat member. 
   
   
     4. The fuel injector according to  claim 1 , wherein the valve needle guide extends as a hollow cylinder from an end face of the valve-seat member. 
   
   
     5. The fuel injector according to  claim 1 , wherein the fuel channels are arranged axially offset from one another. 
   
   
     6. The fuel injector according to  claim 1 , wherein the fuel channels have tangential components relative to a center line of the fuel injector. 
   
   
     7. The fuel injector according to  claim 6 , wherein each tangential component is oriented in a same direction. 
   
   
     8. The fuel injector according to  claim 1 , wherein the fuel channels are formed in a plane perpendicular to a center line of the fuel injector. 
   
   
     9. The fuel injector according to  claim 8 , wherein the fuel channels are inclined at an angle relative to an orientation radial to the center line. 
   
   
     10. A fuel injector, comprising:
 a valve-seat member including a valve-seat surface formed on the valve-seat member;  
 a valve needle including a valve-closure member arranged on an injection-side end thereof, the valve-closure member including a guide line, the valve-seat surface and the valve-closure member forming a sealing seat;  
 an actuator for actuating the valve needle; and  
 a valve needle guide configured to one of connect to the valve-seat member and be formed as a single piece with the valve-seat member, the valve needle guide including fuel channels arranged circumferentially in a plurality of rows, the fuel channels including at least one row arranged above the guide line if the fuel injector is in a resting state;  
 wherein the valve needle guide is formed on an inlet-side end face of the valve-seat member;  
 wherein the valve needle guide extends as a hollow cylinder from an end face of the valve-seat member, and  
 wherein the valve needle guide includes an inner wall on which the valve-closure member rests in an area of the guide line.